linux-kernel - Re: [PATCH v5 02/14] media:Add nt8 and nt10 video format.

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Message-ID: <e88f70b1438d4e5b5313aacccb1f369cabe513bc.camel@ndufresne.ca>
Date:   Tue, 27 Jul 2021 13:58:09 -0400
From:   Nicolas Dufresne <nicolas@...fresne.ca>
To:     Ming Qian <ming.qian@....com>, mchehab@...nel.org,
        shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de
Cc:     hverkuil-cisco@...all.nl, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, aisheng.dong@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 02/14] media:Add nt8 and nt10 video format.

Le mardi 27 juillet 2021 à 11:20 +0800, Ming Qian a écrit :
> NT8 is 8-bit tiled nv12 format used by amphion decoder.
> NT10 is 10-bit tiled format used by amphion decoder.
> The tile size is 8x128
> 
> Signed-off-by: Ming Qian <ming.qian@....com>
> Signed-off-by: Shijie Qin <shijie.qin@....com>
> Signed-off-by: Zhou Peng <eagle.zhou@....com>
> ---
>  .../userspace-api/media/v4l/pixfmt-reserved.rst   | 15 +++++++++++++++
>  drivers/media/v4l2-core/v4l2-ioctl.c              |  2 ++
>  include/uapi/linux/videodev2.h                    |  2 ++
>  3 files changed, 19 insertions(+)
> 
> diff --git a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> index c9231e18859b..2deae49210a7 100644
> --- a/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> +++ b/Documentation/userspace-api/media/v4l/pixfmt-reserved.rst
> @@ -256,3 +256,18 @@ please make a proposal on the linux-media mailing list.
>  	of tiles, resulting in 32-aligned resolutions for the luminance plane
>  	and 16-aligned resolutions for the chrominance plane (with 2x2
>  	subsampling).
> +    * .. _V4L2-PIX-FMT-NT8:
> +
> +      - ``V4L2_PIX_FMT_NT8``
> +      - 'NA12'
> +      - Two-planar NV12-based format used by the video engine found on Amphion decoder,
> +    with 8x128 tiles for the luminance plane and chrominance plane.
> +    The number of bytes in one luminance or chrominance row must be divisible by 256.
> +    * .. _V4L2-PIX-FMT-NT10:

There is a large spread of "vendor specific" format that aren't really specific,
or complex enough to be worth being marked as vendor format. As per my reading
of this description, this is linearly layout 8x128 tiled format, with no
compression or anything (well unless you forgot to mention). As a side effect,
we should give that format an explicit name (NT8 is cryptic). What about
V4L2_PIX_FMT_NV12_8L128, my colleague is about to send a proposal in that
direction. That would be NV12 with plane tiled 8x128 bytes and layout linearly,
row by row, left to right. We already have cryptic formats like SUNXI, HM12 that
are literally just that, simple tiling, and we endup having to use obscure
vendor name whenever other HW uses the same.

(this comment extends to the other formats here)

> +
> +      - ``V4L2_PIX_FMT_NT10``
> +      - 'NT12'
> +      - NT10 is a tiled YUV format with 10-bits per pixel with interleaved UV.
> +    It's used by the video engine found on Amphion decoder,
> +    with 8x128 tiles for the luminance plane and chrominance plane.
> +    The number of bytes in one luminance or chrominance row must be divisible by 256.
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index eeff398fbdcc..34e6415e5722 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1402,6 +1402,8 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  	case V4L2_META_FMT_UVC:		descr = "UVC Payload Header Metadata"; break;
>  	case V4L2_META_FMT_D4XX:	descr = "Intel D4xx UVC Metadata"; break;
>  	case V4L2_META_FMT_VIVID:       descr = "Vivid Metadata"; break;
> +	case V4L2_PIX_FMT_NT8:		descr = "Amphion Tiled 8x128 NV12"; break;
> +	case V4L2_PIX_FMT_NT10:		descr = "Amphion Tiled 8x128 10-bit"; break;
>  
>  	default:
>  		/* Compressed formats */
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index 534eaa4d39bc..4836590a690c 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -740,6 +740,8 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_INZI     v4l2_fourcc('I', 'N', 'Z', 'I') /* Intel Planar Greyscale 10-bit and Depth 16-bit */
>  #define V4L2_PIX_FMT_SUNXI_TILED_NV12 v4l2_fourcc('S', 'T', '1', '2') /* Sunxi Tiled NV12 Format */
>  #define V4L2_PIX_FMT_CNF4     v4l2_fourcc('C', 'N', 'F', '4') /* Intel 4-bit packed depth confidence information */
> +#define V4L2_PIX_FMT_NT8      v4l2_fourcc('N', 'A', '1', '2') /* Amphion Tiled 8x128 NV12 Format */
> +#define V4L2_PIX_FMT_NT10     v4l2_fourcc('N', 'T', '1', '2') /* Amphion Tiled 8x128 10 bit Format */
>  
>  /* 10bit raw bayer packed, 32 bytes for every 25 pixels, last LSB 6 bits unused */
>  #define V4L2_PIX_FMT_IPU3_SBGGR10	v4l2_fourcc('i', 'p', '3', 'b') /* IPU3 packed 10-bit BGGR bayer */